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April 9, 1929- w. s. WEBSTER 1,708,490

COMMUNICATION DEVICE Filed Jan. 10, 1923 4 Sheets-Sheet l A TTORNE Y P 1929- w. s. WEBSTER 1,708,490

COMMUNICATION DEVI CE Filed Jan. 10, 1923 4 SheetS- -Sheet 2 INVENTOR IV (STU/'RTWfBSTER A TTORNE Y April 9, 1929. w, s WEBSTER 1,708,490

COMMUNICATION DEVICE Filed Jan. 10, 1923 4 Sheets-Sheet 3 INVENTOR W fl/HRT W555 TER ATTORNEY April 9, 1929. w. s. WEBSTER 1,703,490

' I COMMUNICATION DEVICE Filed Jan. 10, 1923 4 Sheets-Sheet 4 IN V EN TOR W Sru/mr WEB 5775/? A TTORNE Y rents carried by the mains can pass readily:

Patented Apr. 9, 1929.

UNITED STATES WILLIAM STUART'WEBSTER, OF ROSLIND ALE, MASSACHUSETTS, ASSIGNOR IO WIRE- LESS SPECIALTY APPARATUS COMPANY, OF BOSTON, .MASSACHUSETTS, A CORPORA- -'1ION OF NEW.YOBK.

ooMmUNIcA rioN DEVICE.

Application fi ai January lg, 1923. swam;1411,7231" This invention relates to communication devices. I I

The object of the invention is to provide a standard connection between a communication receiving set (such as a radioreceiving set) and electric mains suchasthose to an electric lighting system, whereby the normal currents on the mains. will be prevented from access to the communication receiving set, while the communication-curto the receiving set. V

The invention consists of the construction and arrangements hereinafter described and claimed, and .shown in the drawings; of which I r Figure 1 is an elevatio'n in part section of the completely assembled device;

Fig. 2 is a diagramof the interior and exterior circuit connections, showing the mode ofuse of the device;

Fig. 3 is a central horizontal section line 33 of Fig. 1;

Fig. 4 is an elevation of the left :end of the device shown in Fig. 1;

Fig. 5 is a section at 5- 5 of ing. in thedirectionof the arrows;

along Fig. 6 is a section at 6 6 of Fig. 3, look' ing in the direction of the arrows;

Fig. 7 is a section at 7-7 of Fig. 3, look ing iii the direction of the arrows, the section showing in elevation one of the two insulating members of the casing of the device;

Fig. 8 is a perspective expanded view of the condenser 23-23 of Fig. 2, shown inside the device in'Fig. 3, Fig. 8 showing the arrangement of dielectric and conductin sheets in the condenser;

igs. 9 and 10 are an elevation and plan of a condenser clamping plate and binding post terminal, 7

Figs. 11 and 12 are an elevation and section of the spring clamping plate of the condenser of the device; and I Fig. 13 is a top plan view of condenser 23 assembled with its clamping plates in final form as shown in Fig. 3, and compris ing the parts shown in Figs. 842.

As shown in Figs. 1, 3 and 4, the device has a general resemblance to the ordinary electric lighting plug adapted tobe screwed into the ordinary wall lighting soclret,-the l cit end of the insulating structure having the form of a cylindricalplug on the outsideof which is' located afithreadedkleeve co ntact S and an end contact P adapted to engage" corresponding eontac'tsfidthe vid'e'd' 356st? BP at its oppo- ',-site, or*enl arged end, fan'dfrom this'j'a coinnection may"b'em ade;to'the radioor other -in Fig.f'2,"so thatlthe deviceitself with the electric mainstdwhich it is connected mav erve in 'lieubffspecial aerial wires 'or' rece ivingloo'psf. j

"In ,-'Fig.2, the-binding post is shown" at BPandeonnecced to the primary of a transforiner'T ,of thereceivin set-on the way to'earth via'condens er fii The local circuits of the receiving apparatus mayfcom- [prise any desired arrangement such as that shown elementally. as including the second ary of transformer'T, variable tuningjcondenserfCfif detector D; telephones'PH and telephone-condenser *C Q In Fig."'2, the screw-sleeve contact is shown. at S, and the end contact of the' plug at P. The condense'r, which is located ins-ide' the'devi ce, is shown at. 23, 23. the-"device is screwed fintoI a socket,contact-sleeve' S is connected by house jmain L 'to one side L of the line ,,su'ch as a lightingcircuit, and end contactl is connected through house wiring L with th e'i othcr side EL 0f the lighting main. (One of the mains may be ground, as is Ifrequtantlythe case.) Electrical connection 1 is provided between contact-sleeve S and condenser .23, and connection' 2 is provided between 'end contact P and another part of condenser 23. From a third part of the condenser a connection is provided to binding Ipost BP, and this connection maybe from'a midpoint M of the condenser. The condenser may be in two parts, i. 0., there may be two separate condensers connected together; but, for convenience, as a practical matter, it is preferred to have a single condenser, with suitable connections therefrom, so that there may be some capacity between the binding post, BP and each side of the lighting mains; for by this arrangement, the lighting currents will be contined'to the mains, but the communication currents may pass through the capacity and binding post to the receiving set. The communication curreceivingapparatus as shownat'lth'e right missions.

The assembly IS shownln Fig. The device,- as shown irrits preferred form, coinprises two members A and V of suitable insulating material, such asporcelain or molded composition, constructed as shown to form a housing in the end of the device which has larger diameter. In the interior space is mounted. the condenser having the elements shown. in Fig. Sand the clamping means shown in Figs. 9l2, assembled in Fig. 13. From the condensera lead 1 (Fig. 3) extends tozabrassinsert 26,-t-o which it is soldered. Engaging in the-member 26 is a threaded bolt 27 which provides electri cal connection with contact-sleeve S and holds the latter in place. vA second screw 27 also holds sleeve 28 in place,'by engagement with a nut 28. Nut 28 and insert 26 are located in recesses F in insulating-member A. Another portion of the condenser is connected by lead 2, extending throu h a central hole 2 (Figs. 4 and 5) in the pl dg portion of insulating member A, to a brass insert 2 in the end of the plug. Theend of lead 2 is clamped between. insert 2 and washer?) by the end contact P, which is in. the form of a screw which enters insert 2 (Figs. 3 and 4). Nut 28 may be electrically separated from leadil by a sheet of mica 29' or other insulation inoimted to intervene (Figs; 3 and 5). Brass insert 2.is molded into end projection G (Figs. 3 and 4) of insulating member A.

Insulating members A and V are secured together byt-wo screws 3 (Figs. 44) which extend through holes molded. in in-terior projections of-memibers A and B- (Figs. 5, 6 and 7). The condenser is clamped between metal members 8 and Li shown as plates in Figs. 9 and II and in assembly in Fig. 13. These plates are held in clamping position by bolts .15 and nuts 16. Plate L4- is of spring steel made to be normally bowed (Fig. so that, when clamped in date (Fig. 1 3) its central part-exerts a yielding pressure on condenser-inlea-stack 23. To metal clamping plate 8 (Fig. 9), a threaded post 9 (Fig. I3) riveted at R (Figs. 9 and 10). The interior of insulaiin; casing cover V is formed with a boss B (Fig. 7), against which clamping member 8 abuts. The clan'ipeil condenser (Fig. 13) is secured against boss B (Fig. by nutIO' outside the device. Beyond nut 10 are suitable brass washers 11. The threads of. rod 9 are extended to receive binding scfewBP.

mee i o shown, there are nine mica sheets N and nine toil sheets-to bedwc'ribe'd. In Fig. 8, the bottom corresponds to the left side of the condenser in Fig. 3. The arrangement in general is such that the connection of binding post BPtothecondenser is at a point of the condeaser'intermediate the two connections there-to from contacts S and P respectively. The five foil sheets marked Z (Fig. 8) extend on both sides bevond the stack of micasheets N. Thesefive toil sheets Z are soldered at their opposite project-ing ends to bolts 15 (Fig. 1.3?) of the clamping means. 5 These sheet-s Z are the ones projecting toward-the observer in Fig. 3. The t-wo'foil sheetsmarltedX (Fig.8)

project. from the'left 0tv the stack of mica sheets N iii'Fig. 8 (from the top, Fig.3)

and are soldered to condenser lead 'I (Fi 3), at the top, leading to sleeve-contact S of. the device (see diagram, Fig. 2). The two foil sheets marked 8)" project to theright beyond the stack of mica sheets N and in 3 extend downward and are soldered to condenser lead 2, leading' to end contact P of the device. Although this condenseris not a high potential condenser, yet, if desired, one or more extra mica sheets may be rplaced hetwee'iithe condenser and its meta lic clamping plates 8 and 14. As slated, the connection of the condenser to post 9 and binding screw BPiis byway of the soldering of foil sheets Z to bolts 15 (F g. 13). The capacity of the entire condenser is .001 m'fd; and in the arrangement described the capacity between the binding post and each of contacts S and]? is .002 mid. As shown i 3)", the condenser within the iousing tbrme'd by insulating members A, V,-is imbedded' in paraffin; and this may be done by filling the hollow part of each of members A and V with paraffin and then bringing and securing the two members together, and tightening up not 10 against the washer Q. But in practice it is easier simply to varnish the condenser and let it occupy an air space inside the casing. In any event,- the condenser processed in any suita-l'ile manner involving the use of paraffin wax and high mechanical pressure to secure intimate contact of the sheets, be fore being finished with the covering of varnish.

Fig. 4 shows the completed device, with coi'ifacbsleme S and end' contact P in place th e screws 3 securing insulating memher A of the casingto' casing-cover V, and wire lead 2 emerging from hole 2 in project-ion G of insulating member A, and entering beneath washer 5 where it is held by screw contact P. Contact P, of courie. is adapted to engage the central contact of the lighting socket.

Fig. 5 shows the interior of member A, and Fig. 7 the interior of insulating member through ,clamping'bolts 15.

at their meeting ends. "Fig. Tsho ws mem-; Y

ber V witho ut the condenser attached against boss B; the section being taken Fig. 6 shows ..the condenser'secured by bolts to cover -V 'of Fig. :7,-* the condenser lying within-the enclosure of easing In Fig. 6,ifoils X areshOWnprOjecti-ng at theitopyadaptedfor' soldering'to lead L of Fig; :3; Atthe :bot-

;tom -(-Fig.= 6) condenser sliee'ts Y depend in readine ss for soldering to-lead 2 'of Fig. V3. .i-..-In Fig.36 conducting sheets *Z'are" shown projecting at opposite sides for soldering to clamping bolts '15; as shownin Fig: 13. l

E This :device providcs a convenient standard means 'consistingof a single assembled unitwhereby the operator or user of a radio 'receiving'set or thelike -mayiprovide himself with an operating antenna. merely by screwing the device-into alightingsocket and attaching to" binding post a lead to his -1-eciving-apparatus;

The invention is not limited by the description or drawings I claim; -39. L'An electrostatic'device which comprises two insulating =members secured together and' -constru'cted ;to form an enclosed space between their' meeting -ends';' an electrical sheet condenser located in said space; condenser clamping meansalso located in said space; an end 'contact-and a sleeve contact exposed-at oneend of the device, and a binding post exposed at'itsother end; and electrical 1 connections l between said condenser,

. end contact,'- sleev'e contact and binding post whereby a p ant 'ot the capacity of the con- 1 denser is included-permanently between the end'contact 'andthe binding post, and another part --between the sleeve 1 contact and the binding post, the end contact and the sleeve contact being" connected respectively to the opposite end terminals of the condenser.

2. An electrostatic device which comprises two insulating members secured together and constructed to form .an enclosed space bet-ween their ineeting ends; an electrical -'condenser located in said space; two contacts exposed at one part of the device and a binding post "exposed at anotherpart; said condenser comprising alternate sheets of dielectric and conductor; an electrical connection from one ofsaid exposed con tacts 'to a plurality ofconductin'g sheets of said condenser;- an electrical connection from the other of said-exposed contacts to a plurality of conducting sheets of said condenser which alternate with the'conducting sheets to which:the'first exposed contact is connected; and an electrical connection from -said binding post to conducting sheets oi the tobe considered ascuring said contact to one ofsaid' insulating I members; an electrical connectionnbetween condenser which lie between said alternating sheets which are connected respectively to the two exposed contacts.

3. An electrostatic device. which comprises two insulating members, on one of which are exteriorly mounteditwo contactsand on the other ofswhich iszmounted a=bincling post; an electrical sheetfizcondcnsen and means for clamping the same, both mounted inside the deviceandhaving 'its mid-point connected with the? binding. ost -..a. :ctmnec- :tion-between thecondenser andzeach of said contacts, both of said connections extending thru perforations thruone'of 'said insulating members; and means i-for securing :tbget-hcn -:the two insulatingmembers.

: 4; An electrostatic device which comprises two-insulating members constructed to form an enclosed space between.- thein meeting ends; an electrical condensertand means for clamp ng the same,-- both located insaid space; .two contacts eXteriorlyt-exposed at one part of thedeviceandasbi ndingl post exteriorly exposed'at another part; an.-.electrical connection between one of"said'oon-' tactsand the condenser;said'connection seplace; and means independentofasaid electrical connections and-securingmeans for securing s; the :.two insulating members together.

-5. An electrostatic device which comprises .an electrical condenser; an*insi1lating"-.en

closing casing. therefor; condenser clamping means also located inside said casing; two

contacts ;.and a -binding post fexterio'rly .mounted onrsaid casin means for'elcctrim cally connecting.saidcontacts across the entire capacity of said condenser; and means for electrically connecting said'binding post to apart of the condenser intermediate of the parts which are connectedto said con' taets.

6. An electrostatic device which comprises an electrical condenser; an insulating casing therefor comprising two members constructed to form a housingfbetween them, the condenser being supported in said housing; a wax filling around the condenser in the housing; two contacts and a binding post extcriorly mounted on the casing; and electrical connections between the condenser, contacts and binding post whereby parts oi the capacity of the condenser are included respectively between the binding post and the two contacts.

7. An electrostatic device which comprises an insulating housing consisting of two members secured together and having two contacts mounted exteriorly at one end and a binding post also exteriorly mounted thereon; a condenser located in said housing;

condenser clamping :mean's'also located inside said housing; andconnections inside the device to include the'capmcity of the condenser between-a-oontact and the binding po'st.

8. Anelectrostatic device which comprises an insulating contact-carrying portion and another insulating portion carrying a condenser anda-binding post; two contacts mounted exteriorly of the-first portion; the condenser -a:nd, t l1e bindii1g post being mounted respectivelyv interiorlyand exxteriorly; and'th condenser being enclosed between said twouinsulat ing portions; an

. electricaln connection between the binding post and the .condenseryrmeans inside the housing :for' clamping the condenser I and means .for 2 electrically connecting I the condenser witlit-heicontac-tsw V 9. Anelectrostatic plug,-whi'ch comprises an electrical condense gran enclosure therefor consistingcf an insulating casing and an insulating cover therefor; said enclosure being extended-atone end in the form of a plugfor a socket; clamping means for the condenser; a binding-post structure combined with. the clamping."means and extend ing out of the cover of the enclosure; :1 screw-sleeve. contact-"and an end contact mountedexteriorly on'ithe plug portion-of the enclosure; and electrical connections-inexterior contacts.

11. An electrostatic device which comiprises an insnlating'housing; a sheet condenser-located therein; two contacts located exteriorly on the housing; means tor-clamping thecondenser ;-meansf'for securing the clamped condenser'to the; housing; binding screw combincd-with-said set-tiring means; and meansclectrically connecting the condenser with the contacts and binding post.

12. An electrostatic; device which comprises atwo part insulating member constructcd to form a housing; a condenser therein and mounted on oneof said parts;

two exterior contacts mounted on the second part; a bindingpost mounted on the first part; means for securing; the two parts of the insulating member together; condenser .clamping.;means' and electrical connections bet weerrth'e bindin-gpost, condenser and the two contacts.

13. An electrostatic device which coinprises an insulating member oflarger diameter at one end than at the other the'portion of larger diameter having ahollow interior; a screw-sleeve andan end-contact mounted on the end of smaller diameter; a condenser located in the hollowspace in the portion of larger diameter; means clamping the condenser; a binding poston the portion of larger diameter; two elect-rical'con nections extending from the condenser through the interior of the portion of smaller diameter to the sleeve contact and end contact respectively; and an electrical connection between post. I

14. An electrostatic device which comprises two insulating members-constructed to'form-a housing ;.a condensersupported by one of said members and located in the hous--' ing; a binding post'onthe sameinsu'lati-ng member and electrically connected with the condenser; means clamping the ;condenser in the housing;- and a screw-sleeve and tend contact for socketconnection and=carried and supported byv the other insulatingiinem- Jer. V

15. An electrostatic device which comprises an insulating'plug' having one end of larger diameter than the ot-her and constructed to'form a housing insthe larger end; a screw-sleeve contact andg-an end contact on the portion of smaller diameter; a condenser in said housing; ;means. clamping the. condenser; and a bindingposton the :portion' of larger diameter-rand in electrical connection with the condenser.

16. A condenser and binding .post. constrncti'on for an ,insulated communication cont-act plug, which comprises clamping means for the condenser inside the plug; a threaded rod secured to the clamping means and extending through the insulatiiig'plug from interior to exterior thereof; and a screw on the rod outside the plug to secure the clamped condenser to the plug; the end of the threaded rod beyond the screw being threaded to receive a binding post.

17. An electrostatic device comprising an insulating casing enclosing a; housing space and having one end plug-shaped,provided with exteriorly exposed socket contacts; and formed with a hollow extending longitudinallyto one of said socket contacts; an electrical condenser and a metal member in said housing space a lead from one end terminal of the condenser to said metal member; a; rod extending thru' said hollow iii-the p'lug end of the casing, holding one of said socket contacts to the lug and mechanically and electrically connected to said metal member; means electrically connecting. the other socket contact with the-other end terminal of the condenser; and a binding postmomited in said casing,v extending; exteriorly' there-'- the condenser andt-he bindingof and electrically connected with a portion of the condenser intermediate its said end terminals.

18. An electrostatic device comprising an insulating casing enclosing a hollow space and having one end plug-shaped, provided with exteriorly exposed socket contacts and formed with a hollow extending longitudinally to one of said socket contacts; an electrical condenser in said housing space; a lead extending from one end terminal of the condenser thru said hollow to said contact; means electrically connecting the other end terminal of the condenser to the other socket contact; and a binding post mounted on said casing, extending exteriorly thereof, and electrically connected with a portion of the condenser intermediate said end terminals.

19. An electrostatic device comprising an insulating casing enclosing a housing space and having one end plug-shaped, provided with exteriorly exposed socket contacts and formed with at least two hollows extending longitudinally to said socket contacts; an electrical condenser and a metal member in said housing space; a lead from one end terminal of the condenser to said metal member; a rod extending thru one of said longitudinal hollows in the plug end of the casing, holding one of said socket contacts to the plug and mechanically and electrically connected to said metal member; a binding post mounted in said casing, extending exteriorly thereof and electrically connected with a portion of the condenser intermediate its end terminals; and a lead extending from the other end terminal of the condenser thru another of said longitudinally extending hollows to said other socket contact.

20. An electrostatic device comprising an insulating casing formed at one end with a condenser-housing s ace and at its other end as a contact plug a apted to cooperate with ordinary electric lighting sockets; an electrical sheet condenser in said housing space and arranged withits sheets substantially in the plane of the radii of the plug end permitting a relatively short thickness of the housing space and over-all length of the casing; the radius of the housing space being at least of the order of the radius of the plug end permitting adequate area of the condenser sheets; electrical connections extending from the end terminals of the condenser thru the plug end to the plug contacts; and an electrical connection extending from an intermediate terminal of the condenser thru the insulating casing to the exterior thereof.

21. An electrostatic device comprising a sheet condenser, an insulating casing therefor, and a metal clamping device for the condenser; three condenser terminal-leads extending from the condenser thru said insulatmg casing; one of said terminal leads being connected to said clamping device; and three sets of armature sheets projecting beyond the condenser dielectric sheets, one set connected to said clamping device, and the other two being connected respectively to the other two terminal leads.

22. An electrostatic device comprising a. sheet condenser, a clamping device therefor, and three terminalleads one of which is connected to said clamping device; said clamping device being connected to both ends of a set of armature sheets of the condenser extending in opposite directions beyond the dielectric sheets; and the other two terminal leads being connected respectively to sets of armature sheets projecting respectively in opposite directions beyond the dielectric sheets.

W. STUART WEBSTER. 

